Trolley-head.



T. R. STAM.

TBLLEY HEAD.

ArPLIouloN rmzn 22.13.1909.

Patented Nov. 9, 1909.

/ hwantoz l//fdfw f ikboznud #lim www www 1 TYSON RUSSELL STAM, OF WESTUNION, IOWA.

TROLLEY-HEAD.

Specification of Letters Patent.

Patented Nov. 9, 1909.

Application filed April 13, 1909. Serial No. 489,720.

To all whom it may concern:

Be it known that I, TYsoN RUSSELL STAM, a citizen of the United States,residing at l/Vest Union, in the county of Fayette and State of Iowa,have invented certain new and useful Improvements in Trolley-Heads, ofwhich the following is a specification.

This invention relates to trolley wheels for electric railway cars andespecially to a device of this character in which the trolley wheel willbe so mounted with respect to the body portion of the head that it willalways right itself or tend to return to a position in a vertical planeparallel to the longitudinal axis of the car.

The invention consists of certain novel features of constructionhereinafter fully described and claimed and illustrated in theaccompanying drawings, in which Figure 1 is a perspective view of atrolley head adapted for attachment to any convenient form of pole; Fig.2 is a vertical longitudinal section of the same, and Fig. 3 is ahorizontal detail substantially on the line 3 3 of Fig. 2.

Throughout the following detail description and on the several figuresof the drawings similar parts are referred to by like re erencecharacters.

As indicated in the drawings the base or body portion 10 of the head isprovided with a sleeve 11 for attachment to the pole in any convenientmanner. The base 1() is cupshaped and is provided in its bottom with adepression 12 and a pluralit of raceways 13 and 14 for the reception oseries of antifriction balls 13xi and 14A. The bottom of the cup whereinthe recess 12 is formed is of peculiar configuration as indicated inFig. 3. The main portion of the recess 12 is sector-shaped, the edgewalls 12 of which terminate at their outer ends near the raceway 13 andthe inner ends of said edges are extended parallel to each other forminga neck 12a at the extreme end of which is provided a notch 15.

The turntable 16, upon which the trolley wheel 17 is journaled on atransverse axis 18,

rojects into said cup or base member 10 and 1s provided with raceways16El and 17 complemental to the raceways aforesaid and whereby theturntable is supported upon the balls in both races so that the same mayrotate freely within certain limits, as hereinafter described. The bodyportion of the turntable 16 may otherwise be of any suitableconfiguration or structure. The turntable is provided on its bottom witha downwardly projecting lug 18 which is adapted to engage either of theaforesaid edges 12 limiting the rotation of the turntable as indicatedin dotted lines in Fig. 3. A leaf spring 19 is secured in said lug bydetachable means, such for instance as a set screw 20 and the oppositeor free end of the spring is located in the notch 15. The normaltendency of the spring, therefore, is to restore the turntable andtrolley wheel to the normal midposition indicated in full lines in Fig.3. It sometimes occurs that the trolley head will be displaced from thewire at the time the car may be making a curve and at which time thetrolley wheel is at an angle to the main line of the car. For thisreason therefore, it is desirable to have a means for restoring it tonormal position.

Any suitable means may be provided for inclosing the aforesaid cup 10and retaining the turntable in place. As indicated there is provided atwo-part cap 20 which is received in an outwardly projecting flange 21formed preferably integral with the shank of the turntable, whereby therain will be excluded from the device. The cap 20 may be secured inplace in any suitable way as by, fastening screws 20a.

The trolley head described herein may be made of any suitable dimensionsor materials and certain details of construction may be varied withinthe spirit of the invention hereinafter claimed. A

Having thus described the invention, what is claimed as new is:

1. In a trolley head, the combination of a cup` having a recess in itsbottom, a turntable rotatably mounted Within the cup, and having a lugprojecting downwardly into said recess to engage opposite walls of thelatter, and limit the rotation of the said cup, a spring mounted in therecess and connecting the cup with the lug of the turntable and normallyholding said turntable in a predetermined position, said spring beinghoused between the bottom of the cup and the turntable, and a trolleywheel car- I'ied by the turntable.

2. In a trolley head, the combination of a cup having a recess in itsbottom, said recess being sector-shaped and terminating at one andretaining the turntable in position, and

end in a notclna turntable rotatably mounted a trolley wlieel carried bytlm turntable. 10 in said Cup and having a lug extending into lntestimony whereof l allix my :signature tho recesl to lilnit therotation thereof, a leaf in presenee olf two witnessen.

spring secured in said lng at one end and 'IYSUN RUSSELL STAM. extendingat its other end into said noteli Witnesses:

whereby the turntable will be maintained in ESTHER DANKS,

normal position, means inelosing the cup E. H. ESTEY.

